title: [Brazil's national immunization program: origins and development].
mesh_terms: D001938:Brazil; D006291:Health Policy / Q000266:history*; D049673:History, 20th Century; D049674:History, 21st Century; D007114:Immunization / Q000266:history*
vernacular_title: O programa nacional de imunizações (PNI): origens e desenvolvimento.